Quick question..How deep inset is the screen to the reader? (mine shipped yesterday do I dont have it yet

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I was thinking of just removing the top cover, putting 4 little holes in it and gluing LEDs to the inside. It would have a similar effect as obelix's modified light wedge, but running on internal battery.
Also how much would 80mA draw(20/LED) reduce battery life of the reader itself ? I might even be able to cut that down to 40ish mA total depending on how much light I end up needing..
But this all hinges on the reader screen beeing inset at least a couple mm and there beeing enough room behind it to stuff these leds
Anyone had their reader open to look?